3641639728 has 20 divisors (see below), whose sum is σ = 7219763848. Its totient is φ = 1778474880.

The previous prime is 3641639723. The next prime is 3641639741. The reversal of 3641639728 is 8279361463.

It is not an unprimeable number, because it can be changed into a prime (3641639723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2645853 + ... + 2647228.

Almost surely, 2^3641639728 is an apocalyptic number.

It is an amenable number.

3641639728 is a deficient number, since it is larger than the sum of its proper divisors (3578124120).

3641639728 is a wasteful number, since it uses less digits than its factorization.

3641639728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5293132 (or 5293126 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 49.

The square root of 3641639728 is about 60346.0000994266. Note that the first 4 decimals coincide. The cubic root of 3641639728 is about 1538.5052860903.

The spelling of 3641639728 in words is "three billion, six hundred forty-one million, six hundred thirty-nine thousand, seven hundred twenty-eight".